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Old 06-23-2002, 03:42 AM   #1
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
Vehicle:
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Default Discrepancy between boost gauge and S-AFC. anyone?

OK, I don't get it. I finally decided to re-hook up my Apex'i S-AFC first the first time after I have turboed the car (which is a while).

My Autometer Boost gauge shows ~10 in/Hg lightly accelerating on the highway (about 20% throttle according to the S-AFC) but the S-AFC shows minor positive pressure (Not sure exactly what)

Which is wrong? The Boost gauge shows right around 0 in/hg when the car is off (and about 16 in/hg when idling and cruising) which makes me think the S-AFC is wrong but I don;t understand how electronic gauges (like the S-AFC) can be more off than the mechanical gauges (like the boost gauge). Plus I'm guessing that the boost gauge is correct at WOT in the upper rpm's because it is showing 7psi which is what my wastegate is set to I think. Obviously the S-AFC won't read this because of the Zenier Diode so WOT under boost doesn;t matter for S-AFC MAP readings.

Anyway, anyone else getting a discrepancy between the gauges? what could it be and which is right?
Thanks

Eric
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Old 06-23-2002, 01:40 PM   #2
8Complex

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What sensor is your S-AFC reading off of? If it still isn't hitting boost, and it's reading atm., then I'd be willing to bet that it's set up for a 2-bar MAP sensor or something. You know the feeling of boost, it isn't hitting boost, is it?
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Old 06-24-2002, 01:43 AM   #3
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
Vehicle:
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

Default

OK, I figured it out. I had my pressure in/out sensor set to type one when they were so supposed to be type 5. Now it seems the same and and WOT under any boost it show right around 7 mm/hg vaccuum Which is just barely any vaccuum. That's pretty much what I want. Now If I can only get this damn RRFPR to not give me 95psi at 7psi boost!!!

Eric
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Old 06-24-2002, 01:53 AM   #4
HndaTch627
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'01 GC8 Dinged STM
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Quote:
Originally posted by Imprezinator
OK, I figured it out. I had my pressure in/out sensor set to type one when they were so supposed to be type 5. Now it seems the same and and WOT under any boost it show right around 7 mm/hg vaccuum Which is just barely any vaccuum. That's pretty much what I want. Now If I can only get this damn RRFPR to not give me 95psi at 7psi boost!!!

Eric
nice NOOB!!! haha j/p dood
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Old 06-24-2002, 02:02 AM   #5
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2011 G37 coupe
Vehicle:
2000 2.5RS w/ EJ22T
swap and N20. gone. : (

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Quote:
Originally posted by HndaTch627
nice NOOB!!! haha j/p dood
lol... That was definetly a noob mistake. I have suck

Eric
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Old 06-24-2002, 02:48 AM   #6
HndaTch627
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'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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Quote:
Originally posted by Imprezinator


lol... That was definetly a noob mistake. I have suck

Eric
majorly
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